Publications Internationales
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Item Application of NaOH-activated peanut shells as a low-cost adsorbent for the removal of cationic dyes(Global NEST, 2025) Hamdache, Farida; Halet, Farid; Bekhti, Saida; Chergui, Abdelmalek; Yeddou, Ahmed Réda; Nadjemi, BoubekeurThe main purpose of this study is to evaluate the possibility of using a lignocellulosic residue, peanut shells after alkaline activation, as a low-cost adsorbent for the removal of methylene blue dye from aqueous solutions. Adsorption experiments were conducted by varying parameters such as the initial pH aqueous solution, contact time, temperature, and initial concentration of adsorbate. Results show that pH has no apparent effect on methylene blue adsorption; more than 95% of methylene blue was removed. The adsorption capacity of methylene blue was slightly improved when the particle size of the adsorbent and the temperature decreased. A temperature uptake from 298 K to 328 K induced a decrease in the percentage of methylene blue removal from 91.36% to 84.31%. The kinetic data obtained at different concentrations were analyzed using pseudo-first-order and pseudo-second-order kinetic models. Also, the modeling of isotherm was considered by applying Langmuir, Freundlich, and Temkin models. Kinetic and equilibrium data were best represented by pseudo-second-order and Langmuir models respectively according to determination coefficient R2 and error function values. The ultimate adsorption capacity reached approximately 100 mg/g. Thermodynamics findings revealed that the adsorption proposed is exothermic and spontaneous process. These results show that peanut shells can be a potential adsorbent for organic dyes removal from aqueous solutionsItem Cyanide Removal from Aqueous Solution by Oxidation with Hydrogen Peroxide Catalyzed by Copper-Zinc Oxide Nanoparticles(Springer Nature, 2024) Boutrif, Abderrahamane; Chergui, Salima; Halet, Farid; Chergui, Abdelmalek; Boudriche, Lilya; Ould-Dris, Aïssa; Nadjemi, Boubekeur; Yeddou, Ahmed RedaThis work is concerned with the cyanide removal from aqueous solution by oxidation with hydrogen peroxide H2O2 catalyzed by copper zinc oxide (CuO-ZnO) nanoparticles prepared by co-precipitation method. The influences of catalyst dose, hydrogen peroxide concentration, temperature, and catalyst stability on cyanide removal were examined. The use of CuO-ZnO nanoparticles made it possible to increase the reaction rate, thus showing good catalytic activity. The cyanide removal percentage was increased after 75 minutes of reaction time from 70% to 100% by raising the catalyst dose from 0.25 g/L to 1.0 g/L. Increasing the temperature from 24 °C to 35 °C enhanced cyanide removal rate, the apparent activation energy was then found to be equal to 48 KJ/mol. The nanocatalyst was used again for four successive times and exhibited good stability. The kinetics of cyanide elimination was found to be pseudo-first order with respect to cyanide.Item Cyanide removal from aqueous solution by oxidation with hydrogen peroxide in the presence of activated alumina-supported copper catalyst(Global NEST, 2024) Halet, Farid; Chergui, Salima; Hamdache, Farida; Boutrif, Abderrahmane; Chergui, Abdelmalek; Ould-Dris, Aissa; Boudriche, Lylia; Guénin, Erwan; Nadjemi, Boubekeur; Yeddou, Ahmed RedaCyanide compounds are widely used in some electroplating, chemical, and metallurgical industries. They are often found in their liquid discharges. This work highlights the performance of an activated alumina-supported copper catalyst in the removal of cyanide by oxidation with hydrogen peroxide in aqueous solution. The influence of catalyst dose, initial molar ratio of hydrogen peroxide/cyanides, temperature, and catalyst reuse was studied. The activated alumina-supported copper significantly enhanced the reaction rate showing a good catalytic activity. The efficiency of cyanide elimination was increased after 30 minutes of oxidation from 48% to 98% by increasing the catalyst dose from 1 to 10 g/L. Rising the temperature from 30°C to 40°C promoted cyanide removal. The catalyst can be recycled four times and show good stability. The kinetics of cyanide oxidation was revealed to be pseudo-first-order regarding cyanides. The rate constants as well as the activation energy were determined.Item Oxidation of azo dye carmoisine (E122) in aqueous solution by heterogeneous catalyst CuO/Al 2 O 3 system(2021) Bousalah, Djedjiga; Yeddou, Ahmed Réda; Hachemi, Messaoud; Chergui, Abdelmalek; Nadjemi, BoubekeurHeterogeneous oxidation system for the removal of azo-food dye from aqueous solution was studied in the presence of CuO/Al2O3 catalyst. This catalyst was prepared by impregnation method using a cupric salt solution at pH=5, followed by calcination at 450 °C. The result catalyst was characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy- Energy Dispersive XRay Spectroscopy (SEM-EDX), where the results confirmed a high crystallinity, good chemical stability of the catalyst used in four consecutive cycles and the presence of the elements (Cu, O, Al) composing the catalyst. Several parameters affecting dye degradation such as: solution pH, H2O2 concentration, catalyst dose, and reaction temperature were investigated. CuO/Al2O3 catalyst offers higher activation efficiencies than the homogeneous Cu2+ ions, as well as good operational stability and efficiently generate HO● in neutral aqueous solutions. Complete decolorization (100 %) of Carmoisine (500 mg/L) was achieved in 240 min at neutral pHItem Biosorption of Congo red dye by Aspergillus carbonarius M333 and Penicillium glabrum Pg1 : Kinetics, equilibrium and thermodynamic studies(Elsevier, 2017) Bouras, Hadj Daoud; Yeddou, Ahmed Réda; Bouras, Noureddine; Hellel, Djamila; Holtz, Michael D.; Sabaou, Nasserdine; Chergui, Abdelmalek; Nadjemi, BoubekeurItem Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of activated alumina(Taylor and Francis, 2015) Chergui, Salima; Yeddou, Ahmed Réda; Chergui, Abdelmalek; Halet, Farid; Amaouche, Hamza; Nadjemi, Boubekeur; Ould-Dris, AïssaItem Removal of cyanide from aqueous solutions by adsorption on activated carbon prepared from lignocellulosic By-products(Taylor & Francis, 2015) Halet, Farid; Yeddou, Ahmed Réda; Chergui, Abdelmalek; Chergui, Salima; Nadjemi, Boubekeur; Ould-Dris, AïssaItem Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of copper-impregnated activated carbon(Elsevier, 2011) Yeddou, Ahmed Reda; Chergui, Salima; Chergui, Abdelmalek; Halet, Farid; Amaouche, Hamza; Nadjemi, Boubekeur; Ould-Dris, Aïssa; Belkouch, Jamal